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I 14 August 2000 AGE-NC Project No 95-0128 Page 7of10 ' 3 4 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES MAI received, extracted and analyzed the ground water samples on 27 April 2000 MAI issued a I report dated 04 May 2000 The analytical results from the 26 April 2000 ground water samples are as follows ' TPH-g, TPH-d, and the BTEX compounds were not detected in the ground water sample from the drowned wells MW-1 and MW-3 A low concentration of TPH-d, 160 µg, was detected in the sample from drowned well MW-2 ' Dissolved petroleum hydrocarbons were detected in samples from all the properly screened monitoring wells, with the exception of well MW-7 (MW-4 through MW-6 and VW-1) In ' general, the highest concentrations of hydrocarbons were detected in the water sample from monitoring well MW-5, which contained 38,000 µg11 TPH-g, 3,500 µg/1 TPH-d, 310 µg/l benzene, 490 µg/1 toluene, 2,000µg/1 ethylbenzene and 8,300µg11 total xylenes The lowest suite of hydrocarbon concentrations were detected in the sample from monitoring well MW-4, which contained 280 µg/1 TPH-g, 240 µg/1 TPH-d, 5 4 µg/1 benzene, 1 2 ugll toluene, 6 9 4gll ethylbenzene and 9 6 µg/1 total xylenes • • TPH-d was detected in samples from all the properly-screened monitoring wells, except MW-7, at concentrations as high as 3,500 4g11 (MW-5), but was not detected in samples from the deeper-screen wells MW-1 or MW-3 A low concentration was detected in the sample from the deeper screen MW-2, as noted above • MTBE was detected in all ground water samples collected,with the exception of well MW-1 Detected concentrations of MTBE ranged from 9 4 µg/1 (MW3) to 2,500 µg/1 (MW5) • TBA was detected in the ground water samples collected from wells MW-2, MW-6, MW-7, I and vapor extraction well VW-1 at concentrations of 5 8 µg/1, 240 4g11, 43 4g/l and 35 µg/1, respectively I DIPE,TAME, and ETBE were not detected in the ground water samples collected during the 26 April 2000 ground water monitoring event Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in Tables 4 and 5 The laboratory reports for the quarterly monitoring event (MAI Laboratory ID No 36494 to 36501 and 40969 to 40975) QA/QC reports and chain-of-custody form are included in Appendix F MAI additionally received, extracted and analyzed the ground water samples on 21 June 2000 MAI issued a report dated 10 July 2000 The analytical results from the 20 June 2000 ground water . samples are as follows Advanced GeoEnvironmental Inc